The general formula R-X is that of
a. an amine.
b. an alkyl halide.
c. an alcohol.
d. none of these
b
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A light bulb operating at a dc voltage of 120 V has a resistance of 200 ?. How much power is dissipated in this bulb?
A) 100 W B) 60 W C) 72 W D) 14 mW E) 7.2 W
Cepheid variable stars are more luminous than the sun
Indicate whether the statement is true or false
On a cosmic calendar, in which the history of the universe is compressed into 1 year, when did Kepler and Galileo first discover that we live on a planet in solar system
a) December 17 b)September 3 c) 1 second ago
Write the equation of a wave, traveling along the +x axis with an amplitude of 0.02 m, a frequency of 440 Hz, and a speed of 330 m/sec.
A. y = 0.02 sin [880?(x/330 ?t)] B. y = 0.02 cos [880?x/330 ? 440t] C. y = 0.02 sin [880?(x/330 + t)] D. y = 0.02 sin [2?(x/330 + 440t)] E. y = 0.02 cos [2?(x/330 + 440t)]